Commit b624714b authored by Jacob Keller's avatar Jacob Keller Committed by Jeff Kirsher

fm10k: avoid possible null pointer dereference in fm10k_update_stats

It's currently possible for fm10k_update_stats to be called during the
window when we go down and the rings are removed. This can result in
a null pointer dereference. In fm10k_get_stats64 we work around this by
using ACCESS_ONCE and a null pointer check inside the loop. Use this
same flow in the fm10k_update_stats to avoid the potential null pointer.
Signed-off-by: default avatarJacob Keller <jacob.e.keller@intel.com>
Tested-by: default avatarKrishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
parent 1b00c6c0
...@@ -377,7 +377,10 @@ void fm10k_update_stats(struct fm10k_intfc *interface) ...@@ -377,7 +377,10 @@ void fm10k_update_stats(struct fm10k_intfc *interface)
/* gather some stats to the interface struct that are per queue */ /* gather some stats to the interface struct that are per queue */
for (bytes = 0, pkts = 0, i = 0; i < interface->num_tx_queues; i++) { for (bytes = 0, pkts = 0, i = 0; i < interface->num_tx_queues; i++) {
struct fm10k_ring *tx_ring = interface->tx_ring[i]; struct fm10k_ring *tx_ring = READ_ONCE(interface->tx_ring[i]);
if (!tx_ring)
continue;
restart_queue += tx_ring->tx_stats.restart_queue; restart_queue += tx_ring->tx_stats.restart_queue;
tx_busy += tx_ring->tx_stats.tx_busy; tx_busy += tx_ring->tx_stats.tx_busy;
...@@ -396,7 +399,10 @@ void fm10k_update_stats(struct fm10k_intfc *interface) ...@@ -396,7 +399,10 @@ void fm10k_update_stats(struct fm10k_intfc *interface)
/* gather some stats to the interface struct that are per queue */ /* gather some stats to the interface struct that are per queue */
for (bytes = 0, pkts = 0, i = 0; i < interface->num_rx_queues; i++) { for (bytes = 0, pkts = 0, i = 0; i < interface->num_rx_queues; i++) {
struct fm10k_ring *rx_ring = interface->rx_ring[i]; struct fm10k_ring *rx_ring = READ_ONCE(interface->rx_ring[i]);
if (!rx_ring)
continue;
bytes += rx_ring->stats.bytes; bytes += rx_ring->stats.bytes;
pkts += rx_ring->stats.packets; pkts += rx_ring->stats.packets;
......
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